Either canola oil or  peanut oil should work great, canola oil is generally less  expensive of the two and considered the healthiest, but peanut oil  is often recommended because of the flavor it gives fried foods.   Answer2: I actually read that coconut oil is the best for frying  and olive and avocado oil are excellent choices as well.
So in conclusion: while R itself is mostly written in C (with hefty chunks in R and Fortran), R packages are mostly written in R (with hefty chunks written in C/C++). librestats: How Much of R is Written in R Part 2: Contributed Packages. Posted by David Smith at 14:57 in developer tips, R | Permalink.
A new language standardization process began at the 2003 Scheme workshop, with the goal of producing an R6RS standard in 2006. This process broke with the earlier RnRS approach of unanimity. R6RS features a standard module system, allowing a split between the core language and libraries.